A: 

This would be great but unfortunately you would have to write it yourself. The brute force way of doing this is to have an author form, a formset of books, for each book a formset of sections. Then save the author form. Use that author id to save each of the books in the books formset, and finally use the book ids to save the sections in the sections formset.

I have often considered writing a recursive inline formset but it appears it would take a lot of thought to get right.

Jason Christa
Wow.. that seems like reinventing the wheel.. I'll give passing json a try in that case, since I'm o.k. with bundle/unbundle with it.But thanks a lot ! If I don't receive any other answers, I'll go with this. I was hoping there would be a simpler solution.
PlanetUnknown